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var-scope-local-legacy.mk revision 1.3 
      1  1.3  rillig # $NetBSD: var-scope-local-legacy.mk,v 1.3 2023/12/17 14:07:22 rillig Exp $
      2  1.1  rillig #
      3  1.1  rillig # Tests for legacy target-local variables, such as ${<F} or ${@D}.
      4  1.1  rillig 
      5  1.3  rillig 
      6  1.3  rillig # In the global or command line scopes, the legacy forms are not recognized,
      7  1.3  rillig # as the target-specific variables are not available either.  The expressions
      8  1.3  rillig # are retained so that they can be resolved later, in the target scope.
      9  1.3  rillig .if "${@D}" != "\${@D}"
     10  1.3  rillig .  error
     11  1.3  rillig .endif
     12  1.3  rillig 
     13  1.3  rillig # It's possible to define variables of the legacy name in the global or
     14  1.3  rillig # command line scope, and they override the target-local variables, leading to
     15  1.3  rillig # unnecessary confusion.
     16  1.3  rillig @D=	global-value
     17  1.3  rillig .if "${@D}" != "global-value"
     18  1.3  rillig .  error
     19  1.3  rillig .endif
     20  1.3  rillig 
     21  1.3  rillig 
     22  1.2  rillig all: .PHONY
     23  1.2  rillig 	# Only variables of length 2 can be legacy, this one cannot.
     24  1.2  rillig 	: LEN4=${LEN4:Uundef}_
     25  1.2  rillig 	# The second character of the name must be 'D' or 'F'.
     26  1.2  rillig 	: XY=${XY:Uundef}_
     27  1.2  rillig 	# The first character must name one of the 7 predefined local
     28  1.2  rillig 	# variables, 'A' is not such a character.
     29  1.2  rillig 	: AF=${AF:Uundef}_
     30  1.2  rillig 	# The variable '.MEMBER' is undefined, therefore '%D' and '%F' are
     31  1.2  rillig 	# undefined as well.
     32  1.2  rillig 	: %D=${%D:Uundef}_ %F=${%F:Uundef}_
     33  1.3  rillig 	# The directory name of the target is shadowed by the global variable,
     34  1.3  rillig 	# it would be '.' otherwise.  The basename is 'all'.
     35  1.2  rillig 	: @D=${@D:Uundef}_ @F=${@F:Uundef}_
     36